docstr: Test that `get_single_element()` can consume a nested dataset.
docstr_tok: ["Test","that","`","get_single_element","(",")","`","can","consume","a","nested","dataset","."]
code: def testWindow(self):
      """Test that `get_single_element()` can consume a nested dataset."""
  
      def flat_map_func(ds):
          batched = ds.batch(2)
          element = batched.get_single_element()
          return dataset_ops.Dataset.from_tensors(element)
  
      dataset = (
          dataset_ops.Dataset.range(10)
          .window(2)
          .flat_map(flat_map_func)
      )
      self.assertDatasetProduces(
          dataset, [[0, 1], [2, 3], [4, 5], [6, 7], [8, 9]]
      )
  
file_path: tensorflow/tensorflow/python/data/kernel_tests/get_single_element_test.py
imports: from absl.testing import parameterized
  from tensorflow.python.data.kernel_tests import test_base
  from tensorflow.python.data.ops import dataset_ops
  from tensorflow.python.eager import def_function
  from tensorflow.python.framework import combinations
  from tensorflow.python.framework import errors
  from tensorflow.python.framework import sparse_tensor
  from tensorflow.python.ops import array_ops
  from tensorflow.python.ops import variables
  from tensorflow.python.platform import test
label_desc: Use image node_id 2 for calling the GetSingleElementTest obj's underlying member method code with example usage: obj.testWindow() and returns: dataset_ops